Typewriting machine



July 4, 1933.

w. A. DoBsoN TYPEWRITING MACHINE Filed Feb. 14. 1929 INVENTOR.

raiemeidiiiuiy 4,1933

Application ledvFvebruary 14,1'1929p1`Sera1. No.,339,764t i' i ,This inventionrelates-` to carriage-escapement mechanism forl typetvritingmachines.

and applies more particularly to typewriters oftheportable type, WhereineXtremelight- Aand durability are of .prime importance... n

One `feature of this invention is' the provi, sion-ofv anyescapement mechanismvwhich is i efficient inits operations andreadily-installed v' in the machine,

Another feature 1st-heemployment-*ofthe 'l Another feature l, isiftheprovisiori'for ,r the1 y y l L the rackWhifc'his secnred'tothe carriage of;`

Workingfparts ofthe mechanism of a -`novel" syst-ein ofballloearings Jto-minimize the fricescapementwvheelto form part of a ball-.race

y 7^for'ithe large ball-bearing.' rIhischeapens the construction of the ,partey and lfacilitates their assembly.

Provision is madefor substantiallycnoi'set less return of the carr1a, 3;e,fthe-fescapelnent-j(1k Wheel not rotatingduringy this operation.

In this invention the letter-spacing. escapement-mechanism may be assembled 'complete and mounted asa unitin the machine.l @This y. unit includes Ia shaft and an ,jimprovedaro rangementf ofl bearing supports,therefor,

1 The, movement along With other l features.-

f ofthe escapement-Wheel,'Whichfis mounted on' f lthe-shaft, isc'ontrolled through .the reciprof eating motion of 'ai-holding dog andfa feeding dog, the details of which. are fully disclosed inmy Patent No.11,696,906 of January 1,21929;

' The shaftis provided. with apifnion,-lfree to` rotate `on` the shaft, independentv ofthe esvcapement-,Wheel in onedirecti'onduring the carriage-return movementbutg is "prevented from-moving, independently yoffthefgescape-"'ingthe(operation,ofthe machine, .y

ment-,Wheelfain-theopposite directionduringA l A letterspacing ley reason of LapaWl mounted" on the-y escapement-Wheel ,and engazgfingfv the i :teeth offthepinion. During the letterfspac-; ing operation Lof the mechanism,4 therefore,l the 'pinionrandthe escapeinent-vheel :rotate ,togetliem` f Whereas on A' the'.` carriage#*I'etu'ri 1fv t 'movement of the machine, the pinion rotates;

independently Vthe es'capementevvheel andf f the escapementwh'eel remains j statitnarjy.`

Winni/1v1 A.,flnoissoiv,V for isniijenroiim,"`ooniviiotrionni AssIGnon@To unnnnwooii [ELLIOTT EiTSHwERCQMBMYQQFQNEW YORK; N.,"Y.,ACoRronATIon-or pEnAwARE y lThe 4pinion is inacontinuous engagement with lthe machine, t,

ference` in 'n size ,off ther ball-bearings" enablesv 'l tliefsize'of the Vmechanismto lo emateriallyre-y "i ducved While providing for rigidity/. The'. 'smallrballfbearing'is mounted;on the rear end of vtheuyshaft, `Whilethe largef.ball-loearing isI j mounted immediately -f in'` front thereof, y and vtowards the center grof., the rv':.=,l,1aft.,j-ln order l'to form aseat'forthe ylarge ballbearin'g, the"` shaftis providedwith'aflange,up'on-the'pff f 5 riph'ery of which the large balls can rotate, andto `siniplifythe construction of thelballn ,e

racerthe escapement-Wheelismounteddirecti ly' against the side -ofithis "flangeformingy S0' y ,therewith part of the race, forl thejballs. y I i Upon thatlportion Vofthe shaft.extending` beyond` the escapement-Wheel isfmounted the 'f ra'clr-erl'gaging" pinion, retained on fthel shaft yby a,llargeheaded"screw,inserted longitudif 1nallyinIthe'endgof; the shaftthe h'eadofthe screw `extendingbeyondthe periphery ofthe n shaft-forming. alshoulder for this purposel t The opposite end 7offthe'shaft'has .tvvo nuts '96 "z 'l mounted thereon. The' inner nut is'facedlto y 'form'. in 4part a raceffforthesmall ball-bearn ing .and provides means of adjustmentvfor ,y hoth bearings- ,l The second i'nut-v lockstherv fnut to prevent :turningfafter the balli-g bearings have heen'adjiistedltherebyf 'ff-nani be, noted thathefescapemeng-,W feel@ f andxthegfaced nut'u'ar'e thrustjibearingsfor n thelongitudinal)strainsthatrare; set up durf-k I. t

' tracks 11 (one not shown). Balls 12 travel on said tracks and support a carriage 18 movable on the track. The carriage 18 has a platen" 14 rotatably mounted therein, and againstl which the usual type-heads (not shown) can strike. The carriage 18 has secured thereto a rack 15. The frame suports a snrin -drum 16 which is connected 1 9 by a tape 17 to the carriage for drawing the latter in letter-feeding direction from right to left in the machine.

The frame 10 has secured thereto a plate 18 upon which the escapement-mechanism is assembled as a unit. This plate supports a holding dog 21 and a feeding dog 2O mounted in a member (not shown) and which may be pivoted at 5() to lugs 51, as more fully described in the above-mentioned patent. The plate 18 is offset at 22 and has a centrallylocated hole 28 therein. In this hole a hub 24 of a ball-race 25 is tightly fitted with its flange 26 abutting said plate 18. This race 25 has a raceway v27 which is shown herein as conical. On the hub 24 a second ball-race y 28 is mounted'with its flange 29 against said plate 18. Theball-race 428 Yhas a beveled internal shoulderv 80, against which the end of the hub 24 is riveted over to force together' the plate 18 and the two ball-races 25 and 28,

- The ball-race'28has a raceway 81 which may also be conical, as shown.

A shaft 82 has an integral flange 48 having an annular seat or shoulder 88 and a ballrace 84. An escapement-wheel 85 is assembled immovably on the seat 88 and abuts .the side of said ball-race 84. A pinion 86 is rotatably mounted on the shaft 82 and is held thereon by the head of a screw 87, which is screwed into the end of the shaft, the head ofthe screw 87 having a larger diameter than the shaft 82 to retain the pinion 86 on the shaft 82. The pinion has a hub 88 to reduce end friction that might be caused by the pinion-teeth 89.

When the escapement-wheel 85 and pinion `86 have been assembled on the shaft 82, the

latter is passed through the hub 24 until the escapement-wheel `85 rests against balls 40. A faced cap' 41 is then screwed on the shaft 82 for adjustment with balls 42, andis retained in adjustable position by a lock-nut 48. This assembling of the parts holds the cscapement-wheel 85 and pinion 86 in fixed rotative relation with the plate 18 and therefore with the machine.

ln order to prevent independent counterclockwise rotation of the pinion during letterspace actuation of the escapement-wheel 85, the latter has a stud 44 in which is set one end of a curved leaf-spring 45. The latter' presses against a pawl 46 pivotally supported on a stud 49 on said wheel, and which pawl' 46 engages the teeth 89 of the pinion 86 to hold said wheel 85 and pinion 86 in fixed relation during letter-spacing operation. fhen the carriage 18 is returned to the right for typing a new line, the rack is also carried to the right, thereby rotating the pinion 86 clockwise. The pawl 46 does not transmit this motion to the escapement-wheel 85, so that during this operation the escapement-wheel 85 and the dogs 20 and 21 are stationary. Considerable noise is prevented by this arrangement. Tnv order to provide the escapement-wheel 85 andl parts with a positive lock against moving during the carriage-return operation, a pawl 19, pivoted to the plate 18, engages the teeth of the escapement-wheel 85 when urged to rotate clockwise.

In order to provide spaceA for the shaft 82, cap 41 and lock-nut 48, a hole 47 is made in the frame 10, as shown in Figure 8.

It will be understood, of course, that various modifications might be made in the shape of the ball-races and 28, or, in other details, without departing in any way from the scope of this invention.

The bracket 18, forming the'main member of the escapement-nnit, corresponds with the bracket 67 of said Patient 1,696,906, (said bracket 67 having ears 66 corresponding with ears 51 havingpivot bearings 50 atl Figure 1 of this case). This bracket is screwed to the shift-frame 10 of an Underwood portable typewriting machine. y

Variations may be resorted to within the scope of the invention, and portions of the improvementsY may be used without others.

Having thus described my invention, I claim:

1.111 a carriage-feeding device for typewriting machines, the combination with a carriage and means for moving the same, of a letter-spacing mechanism including a shaft rotated in one direction by the carriage, an esca] iemen.twheel and flange on the shaft, a pair of ball-bearings of different diameters for the shaft, the smaller one bearing' directly against the shaft, the larger one opposed to the smaller and bearingagainst the periphery of said iiange, the side of the escapement-wheel bearing against the large ball-bearing' and taking the endwise thrust of the shaft in one direction, a carriage-rack. a pinion loose on said shaft and wholly supl @fibel-bearings onjbearing acting directly agiainst 1- tl i'e .'shaftl 'l f- 1- the, other actingvagainst 'the peripliery of said iangje", aan escapeinen g3'. A'letter-spacingdevice.

intermittent 7' for thes'h'aft includinga-pazir ofannular ball f tween the maohlirle;I

saldi esoapement{WleeLQfand :an iinterrnittng device 'controlling the; mechanism i foi t'epinoveinent tion yitl1.=ia

. shafueffecftv'e. to be rotated y1in one bythe carriage' ,fflangejonthe sli'af Wholly' supporti the'.

connecting said'pinon to said Whgeel', means .riage' ajstep-'bystep ymovement durin'g. tlie f typing operation,j i saidballlbearings and Ine'ans upon the lendofthe shaft.tor'tig' ht L `'1ening looth'ball-bearings..y'y-

a bracket. placedV between and fixed directlya'tliereto deviceQhaving ail-opening thereinggarotatablef`' K,

` sliaftactuatedby'said car1iagemeanscoat shaft forgiving the .carriage an.

ingr With the,

feed, and 'a pair of ballbearlno In 'an es c apelne ntfunity forfatta clirnciitv to' a. typewr itingnf1acli ine?,=they Combination-of' f inain loracket,"`anannularball-cupl fitted I l' against' one side of s'aiclbr'acketl and hating" a in za.' perforation in said l bracket; a secondl annularball-cuplupon?the hubportion fitted l. rother side offsad'braoket and Ai'ltfteol'upon'said hulo,v means forcing said!eups` againstfftlief; opposite faces of vsaid bracket., yzusli'at extending through the oups and 'bearing, an escape# ment-Wheel, a row olf/ balls =i-nft he fir cup against one s1de1offsa`id bracket'-an'd'liaifing,ai

`posit/e faces of said bracket, shaft extend# Wheel on .said

for typ ewritingflnaoliine carriages including a support'fortlie 11;

support'y be', 'f

y,tlieOther' set,y oflballs' intoits lcup 'andI i through thesothemip 'mi homie-g the-later tach'nen'tto a typewriting machine, thefoonlleinen@,aana-@braekeeef @woei-reune Sets ofbearingballsganannulaif'cup upon ovne'fside vi; of saidloracket' lfor. fone set f of Balls; fannu` lar fcupfupon the other' side o`f-saiclloraolet eon'ined by* "the seconda c`ujp 1 andv lje'aring against said, escapeinent-Wlieel5 cap threads;

ette.

said bracket, Salida, I)oa-Wl l'ietW'e-en tli nient heel fandthfevpnon- 'f carriage-escapelnen-,

' "typezwriting in'achindfthecorn ttwoflreula Sets? fen: fannulafuii 190,11 :911.61

' the/felle e @of weee@ en?@mennen ztighfien-ingf-boefseefff balls-one of-Sfaidcup's havng'a'hulo extending.

agains'jt'said brackeu Shln a 1carriagefescapenaenteiinitfforatforftlie .other setfof balls'nieansl'securin'g said 'Sides-'1 ebeckeegfa 'einheiten-(11mg through s aldi annular cu-psv r and througli "s aid de of Vsaidescapementwheel the mais@ thrust of the" shaftxinlon direc- 1 rommeans adgus'talole upon tlie end ofthe .shaft for pressing they other setfoffballsl into Cf el Aening both sets of balls, a pinionfupon the other side of said escapement-Wheel for engagement with a cariage-rack, and a drivingv pavvl between said ment-Wheel.

9. ln a carriage-eecapeinent unit for attachment to a typewriting machine, the combination With a bracket, of two circular sets pinion and said escapeof bearing balls, an annular cupnpon one side of said bracket for one set of balls, an annular cup upon the other side of said bracket for the other set of balls, means securing said bracket and cups together, one of said cups 'forming arivet Which rivets both cups to the sides of said bracket, a

and Said cups being at the other side of "said framework-member. l f

WiLLrAM A.' noneon. 

